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Iterative Coded Pulse-Position-Modulation for Deep-Space Optical Communications

Iterative Coded Pulse-Position-Modulation for Deep-Space Optical Communications,10.1109/ITW.2007.4313051,Maged F. Barsoum,Bruce Moision,Michael Fitz

Iterative Coded Pulse-Position-Modulation for Deep-Space Optical Communications   (Citations: 11)
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This paper presents and compares two iterative coded modulation techniques for deep-space optical communications using pulse-position modulation (PPM). The first code, denoted by SCPPM, consists of the serial concatenation of an outer convolutional code, an interleaver, a bit accumulator, and PPM. The second code, denoted by LDPC-PPM, consists of the serial concatenation of an LDPC code and PPM. We employ Extrinsic Information Transfer (EXIT) charts for their analysis and design. Under conditions typical of a communications link from Mars to Earth, SCPPM is 1 dB away from capacity, while LDPC-PPM is 1.4 dB away from capacity, at a Bit Error Rate (BER) of approximately 10-5. However, LDPC-PPM lends itself naturally to low latency parallel processing in contrast to SCPPM.
Published in 2007.
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    • ...information ; IL X can be calculated as [16]:...
    • ...Note that in this paper we assume a symmetric Gaussian distribution for variance of X and numerical evidence shows that as the iteration time increases px % follows a Gaussian distribution as well [16]...

    Jingyuan Fanet al. Design and evaluation of an IDMA cooperative relay free-space optical ...

    • ...OWER-EFFICIENT modulation schemes, such as pulseposition modulation (PPM), are widely adopted in current deep-space optical communications [1]–[4]...
    • ...Therefore,ourscheme employs LDPC encoders/decoders operating in parallel at data rate ( is the symbolrate),while[1]employsoneLDPCencoder/decoderoperating at data rate , which is more challenging in multi-Giga symbols/s range...
    • ...The codeword length is shorter than that in [3], column-weight is set to 3, while the complexity of regular quasi-cyclic code is lower than that of irregular LDPC code used in [1], whose column-weights range from 2–6 with distribution given in [1]...
    • ...The codeword length is shorter than that in [3], column-weight is set to 3, while the complexity of regular quasi-cyclic code is lower than that of irregular LDPC code used in [1], whose column-weights range from 2–6 with distribution given in [1]...

    Ivan B. Djordjevic. Multidimensional Pulse-Position Coded-Modulation for Deep-Space Optica...

    • ...Pulse position modulation (PPM) and error-correcting codes (ECC), such as Low-density parity-check (LDPC) code, Turbo code, have been widely investigated in space optical communication systems for their superior performance [1-2]...
    • ...n in a signal slot [1-2]. !...
    • ... Therefore, in [2], EXIT chart is used to Poisson channel...

    Jianzhong Guoet al. Performance Analysis of PA Coded Pulse-Position Modulation for Space O...

    • ...We found out that a somehow similar scheme has been proposed by Moision and Hamkins in [20], [21], [22]...

    F. Xuet al. Pulse position modulation for FSO systems: Capacity and channel coding

    • ...In the SCPPM scheme, the information bits are first encoded by using an outer code, which is a binary convolutional code [12,31]...
    • ...The use of accumulated PPM allows the iterative decoder to obtain better performances [31] but increases its complexity...

    Fang Xuet al. Coded PPM and Multipulse PPM and Iterative Detection for Free-Space Op...

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